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Is returning by rvalue reference more efficient?
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Beta_ab&&
Beta::toAB() const {
return move(Beta_ab(1, 1));
}
This returns a dangling reference, just like with the lvalue reference case. After the function returns, the temporary object will get destructed. You...
Getting a list of associative array keys
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You can use: Object.keys(obj)
Example:
var dictionary = {
"cats": [1, 2, 37, 38, 40, 32, 33, 35, 39, 36],
"dogs": [4, 5, 6, 3, 2]
};
// Get the keys
var keys = Object.keys(dictionary);
console.log(keys);
See reference below...
Selecting a row of pandas series/dataframe by integer index
...curious as to why df[2] is not supported, while df.ix[2] and df[2:3] both work.
6 Answers
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What is the difference between char array and char pointer in C?
I am trying to understand pointers in C but I am currently confused with the following:
8 Answers
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How to generate random number with the specific length in python
Let say I need a 3 digit number, so it would be something like:
8 Answers
8
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What's the difference between echo, print, and print_r in PHP?
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print and echo are more or less the same; they are both language constructs that display strings. The differences are subtle: print has a return value of 1 so it can be used in expressions whereas echo has a void return type; echo can take multiple parameters, although such u...
Can I read the hash portion of the URL on my server-side application (PHP, Ruby, Python, etc.)?
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The main problem is that the browser won't even send a request with a fragment part. The fragment part is resolved right there in the browser. So it's reachable through JavaScript.
Anyway, you could parse a URL into bits, including the ...
Is there an “exists” function for jQuery?
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In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else true. So you could write:
if ($(selector).length)
You don't need that >0 part.
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Include an SVG (hosted on GitHub) in MarkDown
I know with that an image can be placed in a MD with the MD syntax of either  or  , but I am having difficulty placing an SVG in MD where the code is hosted on GitHub.
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Returning the product of a list
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Without using lambda:
from operator import mul
reduce(mul, list, 1)
it is better and faster. With python 2.7.5
from operator import mul
import numpy as np
import numexpr as ne
# from functools import reduce # python3 compatibility
a = ra...